EP2943094B1 - Item of seating furniture - Google Patents

Description

The invention relates to a seat piece of furniture in the manner of a cushioned sofa or upholstered chair with a base, a seat surface unit, a backrest unit with a back abutment surface and a headrest unit with a head abutment surface. In this case, the headrest unit generic seating furniture pieces between a stowage position and a functional position is displaced. In the functional position, the head abutment surface substantially aligns with the abutment surface to allow for comfortable sitting. Furthermore, the headrest unit generic seating furniture pieces is arranged in the stowage position such that the head abutment surface is arranged completely behind the back abutment surface and below the upper edge of the back abutment surface.

Generic sofas and armchairs represent an alternative to such sofas and armchairs, which either have no headrest or have a firmly integrated and can not be brought into a stowage headrest. While easy chairs and sofas without headrest Fatigue-free sitting can not last for a long time and can cause neck pain, but the aesthetics are often detrimental to armchairs and sofas with integrated headrests. As a further variant can be found in the prior art, the possibility to equip seating furniture with a removable headrest. However, this leads to the obvious problem that the headrest must be stored elsewhere in the not attached to the seat piece of furniture.

Against this background, explained below already known seating furniture pieces form an alternative. In these, the displaceability of the headrest unit with the head bearing surface between a stowed position and a functional position is provided. The headrest unit is thus displaced in such a known seating pieces in the storage position relative to the functional position, which serves in particular the purpose of reducing the height of the seat piece of furniture when not using the headrest unit and thus to improve the aesthetic impression.

The most common in the market design of such known seating furniture with guided displaceable head restraint unit provides that these headrest units are provided in the manner of usually thinly padded sheet-like element which forms in a stowed position a horizontally lying upper end of the seat piece of furniture back of the backrest unit and above the back abutment surface , The disadvantage of such designs, however, lies primarily in the fact that the aesthetic degrees of freedom for the design of such a headrest unit are very limited if it represents another functional element of the sofa in the stowed position, so for example, the said upper end surface. In particular, this design leads to the fact that the depth of the sofa beyond the back abutment surface is also influenced by what dimensions the head abutment surface in the functional position the headrest unit should have. In turn, impact is often an aesthetically detrimental impression.

Also known are the aforementioned pieces of seating furniture in which the headrest unit is arranged in the stowed position behind the backrest, from where it can be moved to the functional position. The DE 9420616 U1 and the DE 20000601 U1 show such pieces of furniture, in which case both a translational displacement of the headrest unit and a rotatable displacement are proposed.

Task and solution

The object of the invention is to develop a generic piece of seating furniture to the effect that this allows a particularly convenient displaceability of the headrest unit.

According to the invention, this object is achieved in that the head restraint unit can be pivoted along a non-linear movement path about a head restraint axis fixed to the base or can be displaced along a linear movement path relative to the base. Furthermore, according to the invention, the backrest unit of the piece of furniture is displaceable relative to the base along a second movement path deviating from the non-linear or linear movement path of the headrest unit and provided for manual movement. The movement of the backrest unit is coupled to the movement of the headrest unit via a movement mechanism of the headrest unit.

An inventive piece of seating furniture thus has, in accordance with generic seating furniture pieces on a base, which in particular includes those components that are used to set up the piece of seating furniture are provided, ie in particular the feet of the piece of seating furniture. Furthermore, a seat surface unit is provided, which is usually provided fixed to the base, but in individual cases may be designed to be displaceable relative thereto. Beyond that seat unit, the backrest unit is provided with said back abutment surface. In a functional position above the back abutment surface and thus usefully usable, the head abutment surface of the headrest unit is provided. In the functional position, the back abutment surface and the head abutment surface are aligned with each other, which is to be understood as being arranged relative to one another in human anatomy. This usually means that average normal vectors on the back abutment surface and the head abutment face together at an angle of not more than 30 °.

In the context of the present description, reference should be made to the following: "furniture upright" means a vertical direction relative to the footprint of the piece of furniture. The furniture transverse direction is the direction in which extend the front end edge of a seat and the upper end edge of the backrest surface. The furniture longitudinal direction is the furniture vertical direction and furniture transverse direction orthogonal direction. When spoken in the context of the furniture longitudinal direction from the front, this means the direction of the backrest in the direction of the seat facing direction. Rear accordingly means the reverse direction of the seat in the direction of the backrest. Further, when described in the context of this description by prepositions such as "over,""under,""behind," and "before" relative arrangements, these statements always refer to only one of the three basic directions and, unless otherwise indicated, do not provide any Statement about the other basic directions.

In a generic piece of seating furniture is further provided that the head restraint unit is arranged in the stowage position such that the head abutment surface is located completely behind the back abutment surface based on the furniture longitudinal direction and completely below the upper edge of the abutment abutment surface based on the vertical furniture direction.

The movement mechanism of the piece of seating furniture is advantageously designed such that the head restraint unit is displaceable along a non-linear movement path from the stowed position into the functional position and from the functional position into the stowed position.

Under such a nonlinear motion path, any motion path deviating from purely linear orientation is considered. By means of a non-linear movement path, it is possible to realize various configurations which are advantageous with regard to the sequence of movements and / or the simplicity of the mechanism. As a movement mechanism for achieving a non-linear movement path is understood in the context of the present invention, such a movement mechanism in which the headrest unit as a whole in a positively coupled manner such a movement path, for example by two superposed movements in different directions are forcibly coupled together by the movement mechanics which take place one after the other or over the course of movement to a variable extent. In addition to such movability of the head restraint unit as a whole, a further mobility, in particular a readjustment of the alignment of the head abutment surface, can not be provided in individual cases, without this being a departure from the solution according to the invention.

Instead of a non-linear movement path, however, a linear movement path of the headrest unit can also be provided. This could for example be alone in Möbelhochrichtung, in which case a hereby positively coupled or independent displaceability of the backrest unit forward to transfer from the storage position is required in the functional position. Preferably also combined with such a mobility of the backrest unit, however, a staff linear motion path can be provided by the headrest is displaced from the stowed position to the functional position at preferably constant orientation of the head contact surface by upward in furniture longitudinal direction and furniture upwards is linearly displaceable. A linear movement path is technically preferably realized by a linear guide.

According to the invention, it is provided that the backrest unit of the piece of seating furniture can be displaced relative to the base along a second movement path deviating from the movement path of the headrest unit and is provided for manual movement. The movement of the backrest unit is coupled with the movement of the headrest unit via the movement mechanics of the headrest unit.

It is thus proposed according to the invention that the backrest forms an actuating handle for displacing the headrest. This can facilitate handling and also improve the subjective comfort impression by avoiding the immediate manual handling of the headrest unit.

Due to the manual handling of the backrest unit, in particular its manually caused pivoting, the transition of the headrest unit between the functional position and stowed position is effected. To bring the headrest in the functional position, the backrest unit be moved along its path of movement. By coupling the backrest unit with the movement mechanics of the headrest unit, it is displaced along a path deviating from the path of movement of the backrest unit in the direction of the functional position.

The arrangement of the head abutment surface in the stowage position of the head restraint unit below the upper edge of the back abutment surface and behind this provides the ability to hide the headrest unit as a whole or at least their head abutment surface in the stowed position, so that the shape of the head abutment surface alone optimized for their function in the functional position can be. In order to store the headrest unit in its stowed position within the smallest possible space, it is considered advantageous if the head bearing surface with the furniture vertical axis in the stowed position an angle between 0 ° and 60 °, in particular between 30 ° and 60 °. Depending on the type of movement mechanics, the head abutment surface can point forwards or backwards in the stowage position of the head restraint unit.

Naturally, the head contact surface is usually not completely flat in pieces of seating furniture according to the invention. Insofar as in the context of this description angles are given in relation to this or other surfaces that are not planed in practice, these relate in each case to a plane which is largely parallel to the respective surface whose normal vector coincides with the mean normal vector of the surface which is not completely flat.

The said alignment of the head contact surface in the stowed position causes the head contact surface in the stowed position of the headrest unit is arranged approximately parallel to the back abutment surface (+/- 20 °) and thus can be stowed particularly space-saving.

In the functional position, the head contact surface with the furniture vertical direction preferably includes an angle between 0 ° and 30 °, in particular between 0 ° and 15 °. Such an almost vertical orientation is ergonomically advantageous. Despite the aforementioned substantially aligned arrangement of the back abutment surface with the head abutment surface in the functional position, it is considered advantageous if the head abutment surface protrudes forward slightly over the exact alignment of the abutment abutment surface. This too is still understood to be essentially aligned in the sense of the present invention.

The movement mechanism, which controls the transfer of the headrest unit and in particular defines the relevant movement path can be designed in various ways. A comparatively complex design, which may be advantageous, is the design in which the head restraint unit is displaceable by means of two separate pivoting levers, each having spaced-apart pivoting axles fixed on the one hand to the backrest or base and the other to the head restraint unit , By divergent lengths of these pivoting lever, a movement path can be achieved by the headrest unit is initially transferred to the transfer to the functional position, especially in Möbelhochrichtung up and towards the end of the movement mainly in furniture longitudinal direction forward.

A particularly advantageous embodiment in economic terms provides that the headrest unit can be pivoted about a headrest rotation axis fixed to the base or to the backrest unit. Such an axis of rotation is preferably an axis of rotation extending in the direction of furniture transverse direction, which is structurally preferably formed by a torsion tube. Such a pure pivoting of the headrest unit is highly robust and very easy and inexpensive to realize.

To be able to position the headrest unit and in particular its contact surface in the stowed position as low as possible in the case of a design with such a headrest rotation axis, it is advantageous if the headrest rotation axis is arranged below the upper edge of the back abutment surface, in particular preferably at least 10 cm below the upper edge of the back contact surface. In such a configuration is particularly advantageous if the headrest unit comprises a padded headrest portion which also includes the head bearing surface, and moreover comprises a headrest linkage which provides the connection between the headrest portion and the headrest rotational axis, optionally in the form of said torsion tube.

In the design proposed here, it is preferably provided that the headrest unit is pivotable by at least 90 °, in particular preferably by at least 120 °. In practice, in particular also swivel angle between stowed position and functional position of 135 ° (+/- 10 °) have been found to be advantageous.

The pivoting direction of the head restraint unit from the stowage position to the functional position is preferably directed counterclockwise with respect to a lateral perspective in furniture transverse direction, in which the seat surface unit of the seating furniture piece is arranged on the right side of the back abutment surface, when the headrest unit is pivoted from the stowed position into the functional position. Based on the perspective of a user standing in front of the piece of seating furniture, the head restraint unit thus initially moves towards the user, starting from the stowed position, until it has reached a preferably approximately horizontal intermediate position, from which point on it will then continue up, but at the same time also moved backwards until it reaches the functional position.

Even with the preferred movement of the head restraint unit from the stowed position in the functional position counterclockwise, a phase-wise opposite movement can be beneficial. Thus, the coupling between the backrest unit and the headrest unit may be such that in the course of the overall movement of the backrest unit from a starting position to a subsequently explained reversing position and back to the starting position, the headrest unit is moved to the functional position, but in an initial phase or a final phase is temporarily pivoted clockwise, for example, to invest in return of the backrest unit in the starting position from above to this.

Since, unlike known designs of seating furniture, the center of gravity of the head restraint unit is moved comparatively far upwards in the vertical direction of the furniture in many conceivable designs according to this invention during the transfer to its functional position, it is advantageous if the piece of seating furniture has a first spring means which comprises the headrest unit permanently subjected to force in the direction of their functional position. Such a spring means, which could be formed in a simple configuration, for example by a coil spring, at least partially compensates for the mass of the headrest unit and thus allows a smooth transition into the functional position. Preferably, the said spring is comparatively long, in particular preferably longer than 30 cm, in order to effect a slightly variable spring force in the area used.

Furthermore, the spring is preferably designed and articulated in the piece of furniture in such a way that it is able to move the headrest unit against its weight in an intermediate position between the stowed position and the functional position to keep, in particular an intermediate position in which the head contact surface is oriented approximately horizontally (+/- 20 °). Alternatively or additionally, the spring may also be designed such that it causes a force in the direction of the functional position in the functional position and preferably also shortly before reaching the functional position. Although the spring in the functional position of the headrest unit is preferably already shortened compared to said intermediate position and the spring force is therefore reduced, both the behavior described above in the intermediate position and the behavior in the functional position in a piece of furniture according to the invention can be realized together, as that by the weight of the headrest unit caused moment in the stowed position in the functional position can be very low, if the center of gravity of the headrest unit in the functional position relative to the furniture longitudinal direction by no more than 10 cm, preferably not more than 5 cm, is removed from the headrest pivot axis. In addition, the attachment of the spring may be arranged on the headrest unit so that the corresponding pivot point is in the functional position farther away from the headrest pivot axis than when the headrest unit is arranged in said intermediate position.

As regards the movement of the backrest unit relative to the base, this can be realized in the simplest case such that the backrest unit as a whole can be pivoted about a base-fixed backrest axis. In such a case, since the pivotal axis of the seat back should be located quite far forward of the seat piece to permit movement of the headrest unit on the front seatback unit, another type of construction is considered more advantageous, namely one in which the backrest unit communicates with the base at least two main tabs is movably connected. In this case, the first main tab is a fixed to the base first pivot axis and a fixed to the backrest unit second pivot axis pivotally provided, while the second main flap is pivotable about a fixed to the base third pivot axis and about a fixed to the backrest unit fourth pivot axis. The base-side pivot axes are also spaced apart from each other as the backrest unit side. By means of such a double-strap configuration, it is possible to achieve that the movement path along which the backrest unit is movable is similar to that of a backrest axis arranged far to the front, without requiring this axis. Instead, preferably all four pivot axes of the double-lug system are arranged with respect to the longitudinal direction of the furniture behind the back abutment surface of the backrest unit. This allows the use of a relatively compact fitting. If both main straps have an identical length, in this context the distance between the respective pivot axes of the main straps is understood, the path of movement of the backrest unit relative to the base is circular section-shaped with fixed orientation of the backrest unit. It is advantageous, however, if the backrest unit is displaced in the course of its displacement in an upper region to a greater extent than in a lower region, in particular to provide sufficient space to the headrest unit collision-free in the direction of their functional position or back to the stowed position move. For this purpose, it is preferably provided that one of the main straps is at least 20% longer than the other main straps. Preferably, the shorter main tab is the one that is located farther back in the furniture longitudinal direction. The backrest unit, which is hinged twice to the base by the two main straps, is therefore additionally pivoted as it is displaced along the path of movement predetermined by the double strap.

The compact design of the fitting, which is made possible above all by the double strap system, is particularly advantageous because he hardly any problems with respect to other components of the seating furniture brings with it. Thus, in particular with regard to the upholstery no adjustments must be made that would make such a piece of furniture more expensive.

It is considered to be particularly advantageous if starting from the arrangement of the backrest unit in its normal use position during the displacement for the purpose of movement of the headrest unit initially enters a substantially linear movement phase and the backrest unit pivots only in the course of further displacement to a greater extent. This can be achieved that the orientation of the two main tabs in the stowed position or the functional position of the headrest unit and thus the use position of the backrest unit are aligned substantially parallel (+/- 15 °).

Preferably, not only a first main tab and a second main tab are provided, but there are preferably two first and second main tabs are each pivotable about identical pivot axes and offset in the transverse direction of the furniture offset from each other on both sides of that backrest unit are arranged for the purpose of relocation the headrest unit is displaced. In order to force a uniform pivoting respectively of both first main plates and / or both second main plates, in such a case, the two first main plates or the two second main plates are preferably rigidly connected to each other. This is achieved in particular via a connecting rod which extends in the transverse direction of the piece of furniture and connects the two first main straps or the two second main straps with each other in such a way that they are always only movable together. The connecting rod or the connecting tube extends preferably coaxially with one of the pivot axes of the main tabs in question.

Of particular advantage for this context is a design in which the headrest unit has a furniture transverse direction extending torsion tube, which defines the headrest rotation axis and which receives the connecting rod or the connecting tube between the same type of main tabs in it. This torsion tube preferably extends coaxially to the head restraint axis of rotation.

In particular, preferably one of the pivot axes of a main plate and the headrest rotation axis coincide.

To achieve the desired active coupling between the movement of the backrest unit and the headrest unit is particularly advantageous in the case of said double-lug design, when a connection unit between the second main plate and the headrest unit is provided which pivotable about a relation to the third pivot axis offset fifth pivot axis of the second main lug is attached and which is mounted about a relative to the headrest rotational axis offset sixth pivot axis pivotally mounted on the headrest unit.

In particular, two configurations are of particular advantage: A first possibility is to form this connection unit itself as a rigid connecting link, which defines a fixed distance between the fifth and the sixth pivot axis. In contrast, a solution has proven to be advantageous in which the connection unit has two mutually against a seventh pivot axis pivotally abutting connecting straps, of which a first pivotally hinged to the headrest unit and of which a second pivotally mounted on the second main tab is. To achieve a sufficiently specific system is further provided that the seventh pivot axis about which the connecting straps are hinged together, relative to the base only along a defined path is displaced. This can be achieved by an additional guide plate, which is hinged on the one hand to the seventh pivot axis pivotally mounted on the two connecting straps and on the other hand pivotally hinged to the base. An alternative would be to provide a guide slot or the like, in which the seventh pivot axis is guided.

The advantage of the connection unit with two connecting straps compared to the design with only one rigid connecting strap consists in the thereby achievable influencing of the movement profile of the headrest unit as a function of the displacement of the backrest unit. Thus, it can be achieved via the system with two mutually hinged connection straps that initially takes place during a movement of the backrest unit, starting from the use position forward no or only a slight movement of the headrest unit. However, as the headrest unit decelerates, as the backrest assembly continues to move, it is moved faster than in the case of only a rigid connection tab so that it can more quickly pass the forwardly displaced backrest unit. Thus, the movement profile of the headrest unit changed by two connecting straps allows the use of larger headrest units, since the movement speed of the headrest unit is higher when the backrest unit is moved far forward.

In a particularly preferred embodiment it is provided that the backrest unit is displaceable between a starting position and a reversal position, wherein the coupling of the backrest unit with the headrest unit via the movement mechanism is designed such that the movement of the backrest unit from the starting position in the reverse position and back to the starting position is suitable to relocate the head restraint unit from the stowed position to the functional position or from the functional position to the stowed position.

Thus, it is an always uniform movement of the backrest unit, which causes the transition to the other position depending on the prevailing position of the headrest unit. The ease of use is great by the concomitant simplicity. Both for the transfer to the stowed position as well as for transfer to the functional position, the same type of handling of the backrest unit takes place.

In an embodiment of which are basically two options. On the one hand, it may be provided that in each case only one of the partial movements of the backrest unit, ie from the starting position to the reverse position or from the reversal position back to the starting position, the movement of the headrest unit from its stowed position to its functional position. The respective other partial path of the backrest would then be a free path, which causes no continued or no movement of the headrest unit. This can be achieved, for example, via a switching gear, which causes a phase-wise coupling or decoupling of the backrest to the movement mechanism of the headrest unit. In particular, it is considered advantageous if it requires for the movement of the headrest unit from the functional position in the storage position and / or from the storage position in the functional position each of a coupled transition of the backrest unit from the starting position to the reverse position, while the return from the reverse position in the initial position takes place in the decoupled state and thus no longer has any influence on the movement of the headrest unit.

In contrast, a simplified mechanism results when the backrest unit is permanently coupled by means of the movement mechanism with the headrest unit such that during movement of the backrest unit from the initial position to the reverse position upon reaching the reverse position, the headrest unit is arranged in an intermediate position between stowed position and functional position. After exceeding the reversal position then the movement would continue to reach the respectively desired end position, ie the stowed position or the functional position.

In such a configuration, said intermediate position of the headrest unit is a kind of dead center position, from which a continued movement of the backrest unit back into its starting position can cause both a displacement of the headrest unit in the stowed position and the functional position. Practice has shown that this indeterminacy does not have to be annoying. Since the head restraint unit has already achieved an intrinsic speed by the partial travel traveled, which was achieved by moving the backrest from the starting position to the reversing position, it reliably exceeds the said dead center position and as a result pulls the backrest unit back in the direction of its starting position.

This also makes possible in particular an extremely simple movement mechanism in which the headrest unit and the backrest unit are respectively provided about axes of rotation, the headrest rotation axis on the one hand and the axis of the backrest unit on the other hand, pivotable on the piece of furniture, in particular its base, and are connected to each other only by a rigid transmission member, which is hinged to the headrest unit and the backrest unit eccentric to the respective axis of rotation. This design is very easy especially compared to known displaceable headrests and leads to a perceived as unusual and pleasant Haptic perception, the peculiarity lies in the fact that when you actuate the backrest unit gives the impression that this draw with reaching the reversal virtually by itself back to its original position. However, this is mainly due to the inertia of the headrest unit. Alternatively, designs with a plurality of chain-like coupled transmission elements are also conceivable.

In some cases, it may be advantageous to supplement said extremely simple mechanical design by a switching mechanism which, depending on the initial position of the headrest unit in the transfer of the same from the functional position to the stowed position or from the stowage position in the functional position in the said intermediate position Movement in the direction of the end position (functional position or stowed position) supported by a switching spring means which, depending on the starting position of the headrest unit, causes a force application of the headrest unit in the direction of the respective end position. Alternatively, a design would be conceivable in which the switching mechanism is designed such that it always allows a continuation of the movement only in the direction of the starting position (functional position or stowed position) and in the direction of the end position (stowed position or functional position).

An inventive piece of seating furniture may have behind the backrest a seating piece of furniture to the rear limiting vertical end surface, which could be rigid depending on the type of seating furniture, for example made of wood, or padded. A design of a piece of seating furniture according to the invention is considered to be advantageous, in which the headrest unit has the above-mentioned headrest section, which is connected to the movement mechanism by means of one or more rods, wherein in the functional position of the headrest unit these rods extending through a gap between the backrest unit and said end surface.

To realize the furniture described this may have a fitting. This fitting has a base segment for attaching a seat, a backrest segment for attaching a backrest, and a headrest segment for attaching a headrest. The backrest segment is pivotally hinged to the base segment. Furthermore, the headrest segment is guided displaced relative to the base segment. In this case, the backrest segment and the headrest segment are mechanically coupled such that a pivoting of the backrest segment causes a displacement of the headrest segment.

The three mentioned segments are rigid part of the fitting, which serve respectively for attachment of the respective parts of a piece of seating furniture.

Brief description of the drawings

Fig. 1a - 1c

eine erste Ausgestaltung eines erfindungsgemäßen Sitzmöbelstücks bei einem Übergang seiner Kopfstützeneinheit von einer Staustellung (Fig. 1a) bis in eine Funktionsstellung (Fig. 1c),

Fig. 2a - 2d

eine zweite Ausgestaltung eines erfindungsgemäßen Sitzmöbelstücks, welche zusätzlich zu den Komponenten der Gestaltung der Fig. 1a-1c eine Umschaltmechanik aufweist, deren Zweck im Weiteren noch erläutert wird,

Fig. 2e und 2f

das Sitzmöbelstück der Fig. 2a-2d in einer teilgeschnittenen perspektivischen Ansicht, aus der die Anordnung der Umschaltmechanik gut zu ersehen ist, sowie die Umschaltmechanik in vergrößerter Darstellung,

Fig. 3a - 3f

eine dritte Ausgestaltung eines erfindungsgemäßen Sitzmöbelstücks, bei welchem die Wirkkopplung zwischen der Rückenlehneneinheit und der Kopfstützeneinheit phasenweise hergestellt und gelöst wird,

Fig. 4a - 4d

eine vierte Ausgestaltung, bei der die Beweglichkeit der Rückenlehneneinheit an die Basis über ein Doppellaschensystem realisiert ist, und

Fig. 5a - 5f

den Bewegungsablauf bei der vierten Ausgestaltung ausgehend von der in der Staustellung befindlichen Kopfstützeneinheit bis zur Anordnung der Kopfstützeneinheit in der Funktionsstellung.

Other aspects and advantages of the invention will become apparent from the claims and from the description of preferred embodiments of the invention, which are explained below with reference to figures. Showing:

Fig. 1a - 1c

a first embodiment of a piece of seating furniture according to the invention in a transition of its headrest unit from a stowed position ( Fig. 1a ) into a functional position ( Fig. 1c )

Fig. 2a - 2d

a second embodiment of a piece of seating furniture according to the invention, which in addition to the components of the design of Fig. 1a-1c a switching mechanism whose purpose will be explained below,

Figs. 2e and 2f

the piece of furniture of the Fig. 2a-2d in a partially sectioned perspective view, from which the arrangement of the switching mechanism is easy to see, as well as the switching mechanism in an enlarged view,

Fig. 3a - 3f

a third embodiment of a piece of seating furniture according to the invention, in which the active coupling between the backrest unit and the headrest unit is prepared and released in phases,

Fig. 4a - 4d

a fourth embodiment in which the mobility of the backrest unit is realized to the base via a double strap system, and

Fig. 5a - 5f

the sequence of movements in the fourth embodiment, starting from the located in the stowage headrest unit to the arrangement of the headrest unit in the functional position.

Detailed description of the embodiments

Fig. 1a - 1c show a first embodiment of a piece of seating furniture 10 according to the invention in sectional side views.

Based on Fig. 1a the essential components are explained. The seat piece of furniture 10, which could be designed like the other embodiments, either as a chair or sofa, has a provided for installation base 20, which for below described relative movements serves as a reference system, unless otherwise explained. In addition to adjustable feet 22, this base 20 also includes, for example, a wooden frame 24, which in particular also forms an approximately vertical rear end surface of the piece of seating furniture. Furthermore, the piece of seating furniture 10 has a padded seat surface unit 30, which in the present embodiment is fixed to the base 10, but could also be movable relative to it in other designs, and a backrest unit 40 which provides a padded backrest surface 42 and which by means of a backrest surface stationary linkage 44 about a backrest pivot axis 2, which is extending in furniture transverse direction, is pivotable. On the rear side of the backrest unit 40, the headrest unit 50 is provided. This headrest unit 50 comprises a padded head restraint section 52 with a head restraint surface 54 and a linkage 56 extending therefrom, by means of which a pivotability of the head restraint unit 50 about a head restraint pivot shaft 4 is provided. Part of the headrest unit is also a to the above elements stationary rudder horn 58, eccentrically to the headrest pivot axis 4, a coil spring 60 engages, which is secured to the base 20 at the opposite end.

The pivotable about each in the transverse direction of furniture pivot axes 2, 4 pivotal components of the backrest unit 40 and the headrest unit 50 are operatively coupled together by a rigid transmission member 70. This transmission member 70 is formed as a metallic rod which is eccentrically articulated about a pivot axis 6 on the backrest unit 40 and about a pivot axis 8 on the headrest unit 50.

Fig. 1a shows a stowed position of the headrest unit 50. In this, the headrest unit 50 is based on a furniture longitudinal behind the back abutment surface 42 of the backrest unit 40 and arranged relative to a vertical furniture direction below an upper end edge 42a back abutment surface 42. It is here virtually invisible from the outside and requires no or only a slight increase in the external dimensions of the piece of furniture 10.

In order to move the headrest unit 50 to its functional position, it is provided in the illustrated piece of seating furniture that manual handling of the backrest unit 40 takes place. This is in the Fig. 1a removable way in the direction of the arrow 2a manually pivoted forward, and due to the coupling by means of the transmission member 70 also causes a first oppositely directed pivoting of the headrest unit 50, which has sufficient space due to the displacement of the backrest unit 40, with respect to the figures in the counterclockwise direction to swivel forward.

The Fig. 1b shows an intermediate state in which the pivot axis 2, the pivot axis 4 and the pivot axis 8 are exactly aligned with each other. It is a dead center, in the non-observance of the spring 60 and the weight undefined condition is given in terms of whether the headrest unit 50 returns upon reversal of the direction of rotation 2a of the backrest unit in its stowed position or is pivoted further into the functional position. The backrest unit 40 has reached its front reversing position in this state. If they are now in their starting position of Fig. 1a is pushed back, the headrest unit can thus pivot downwards or upwards.

In practice, however, this is not a problem because in the state of Fig. 1b the headrest unit 50 is in movement in the direction of the arrow 4a. The inertia of the headrest unit 50 ensures that the dead center of the Fig. 1b is overcome and the manually handled Backrest unit 40 almost automatically returns to its original position, as in Fig. 1c is shown. This figure shows the functional state of the piece of seating furniture 10, which can now be used with headrest.

If now starting from the state of Fig. 1c the backrest is again pulled in the direction of the arrow 2a forward, the headrest unit 50 moves in the direction of arrow 4b and thus in the direction of its stowed position. Also in this movement, the dead center of the Fig. 1b , which in turn results in a similar way, not as problematic, because in turn ensures the inertia of the headrest unit 50 a reliable transfer to the functional position.

In the extreme case, the very simple mechanism allows an operation as follows: Alone by a short jerky pulling on the backrest unit 40 forward, the entire transfer from the functional position to the stowed position or from the stowage position into the functional position is made possible.

The illustrated embodiment provides a combination of simple mechanical construction and reliable robust functionality.

Nevertheless, it may be desired in an individual case to make the movement transition safer, so that even a slowing down of the transfer in a dead position of Fig. 1b appropriate design is unproblematic. This is achieved by the following embodiment.

The design of the Fig. 2a-2d corresponds essentially to the mentioned functional difference of the Fig. 1a , As far as the referenced components with respect to their last two digits of the reference numerals are identical, are based on the present invention functionally equivalent components.
The peculiarity here is a changeover mechanism 180. This changeover mechanism 180 comprises reference to FIG Fig. 2a and Fig. 2e a link plate 158, the rudder horn 58 of the embodiment of Fig. 1a-1c replaced. It fulfills all functions that have been explained in connection with the preceding embodiment and also has a link 158a, in which a sliding block 184 is arranged. This sliding block is part of a switch 182, which is hinged to a parallel to the pivot axes 2, 4 pivot axis 9 pivotally connected to the base 120. On the side facing away from the sliding block 184, the switch 182 has a boom 186, which is connected by means of a second spring 188 to the transmission member 170, which in turn effectively connects the headrest unit 150 and the backrest unit 140 with each other.

Due to the design of the scenery movement is achieved, based on the Fig. 2a-2d is explained.

Again shows Fig. 2a a starting position in which the headrest unit 150 is in its stowed position. Again, a pre-pivoting of the backrest unit 140 initially indirectly causes a counter-swinging out of the headrest unit 150, as shown in FIG Fig. 2b will be shown. Unlike the design of the Fig. 1a-1c is the risk of undefined intermediate position, the movements in both directions, ie in the direction of the stowed position as well as in the direction of the functional position allows, not given in the present case.

Due to the in Fig. 2b apparent arrangement of the rotary switch 182, the tension spring 188 acts in their arrangement of the Fig. 2b in the direction of the functional position. The spring 188 effectively pulls the head restraint unit 150 toward its functional position. That the Transmission member 170 facing away from the end of the spring 188 is arranged by the pivoting movement of the switch 182 and the arrangement of the sliding block 184 predetermined.

With reaching the functional position, which in Fig. 2c is shown, the switch 182 is in the in Fig. 2c shown position, for which purpose a stop 158 b is provided on the link plate 158. The gate 158a has for this purpose at its end in the clockwise end over a widened area, which allows this switching. The spring 188 thus passes with respect to an imaginary connecting line between the pivot axes 6, 8 on the opposite side, which is supported in a subsequent transfer of the headrest unit 150 back into its stowed position the movement process required by the spring 188. This is good on the basis of Fig. 2d apparent with respect to the position of the headrest unit 150 and the backrest unit 140 with the Fig. 2b is comparable. Deviating from the Fig. 2b However, the switch 182 is now aligned approximately in opposite directions, so that the spring pushes the headrest unit 150 in the direction of its stowed position.

The Fig. 2e is the structure of the sofa and the arrangement of the switching device 180 in an improved perspective to remove. Both the technical design of this embodiment of the Fig. 2a to 2e as well as the other embodiments of the Fig. 1a to 1c and 3a to 3f can be used in a similar manner in a two-piece sofa or even in an undivided sofa or chair use.

Also can be in Fig. 2e recognize that due to the cranked configuration of the linkage 156, only a narrow gap 124b must remain between the frame 124 and the seatback unit 140 to hold the headrest unit 140 in its operative position.

Furthermore, it can be seen from this figure that the headrest unit preferably has a torsion tube from which the linkage 156 extends. This end is connected to the link plate 158. In the case of a design with a rudder horn according to the designs of FIGS. 1a to 1c and 3a to 3f such a torsion tube may instead be connected in a rotationally fixed manner with these rudder horns. The coupling with the leg rest may be provided on such a torsion tube on one side or even twice and on both sides.

The Fig. 3a-3f show a further embodiment of a piece of seating furniture 210 according to the invention, which is designed as a sofa. In this third embodiment, in turn, those components that are formed in a similar and functionally comparable manner as in the previous embodiments, provided with reference numerals that match each other in terms of the last two digits. Thus, the design of the Fig. 3a-3f a base 220, a seat surface unit 230 and a pivotable about a pivot axis 2 backrest unit 240.

Furthermore, a headrest unit 250 is also provided, which is pivotable about a pivot axis 4 relative to the base 220. The concrete relative arrangement of this pivot axis 4 to the second provided on the rudder horn 258 pivot axis 8 is slightly different than in the embodiment of Fig. 1a-1c For the purpose of the following explanatory purpose, a complete transfer of the head restraint unit 250 from its stowed position would be achieved by a unidirectional actuation direction of the backrest unit 240 Fig. 3a up to their functional position the Fig. 3C to achieve.

This modified type of transfer is the following differences compared to the design of the Fig. 1a-1c owed. Thus, the embodiment of the Fig. 3a-3f Although also a transmission member 270, which is articulated about the already mentioned pivot axis 8 pivotally mounted on the rudder horn 258. Also, the opposite end of the transmission member 270 is consistent with the embodiment of Fig. 1a-1c pivotally mounted about the pivot axis 6 on the backrest unit 240. Here, however, the connection is created by a slot 272, which allows the backrest, starting from the functional state of the Fig. 3d to be able to pivot without thereby affecting the position of the headrest unit. The slot 272 thus allows a decoupling in the manner explained below. Another difference to the design of the Fig. 1a-1c consists in a pivotally mounted on the transmission member locking member 274, the function will be explained below. The locking member 274 is pivotally hinged to the transmission member 270 and has a retaining spring, which is arranged so that it can stabilize the locking member 274 in two opposite end positions.

Starting from the stowed position of the Fig. 3a For the transfer of the headrest unit 250 from its stowage position into its functional position, the backrest unit 240 is also pivoted forward. Since an axle portion 244 of the backrest unit 240, which defines the pivot axis 244, is already disposed at the distal end of the slot 272 of the transmission member 270, this immediately leads to pivoting of the headrest unit 250 in the opposite direction. However, this leads from the design of the Fig. 1a-1c Deviating arrangement of the pivot axes 4, 8 to the fact that already in the movement of the backrest unit 240 from its initial position of the Fig. 3a in their reversal of the Fig. 3b a complete pivoting of the headrest unit 250 takes place in its functional position.

Since continued movement of the headrest unit 250 is not desired, there should be no interaction with the headrest unit 250 in the return transfer of the backrest unit 240 to its original position. This purpose serves the aforementioned slot 272, which in the reference to the intermediate position of Fig. 3c illustrated manner allows an isolated pivoting of the backrest unit 240. Although the transmission member 270 is mitverschwenkt. However, a force application of the rudder horn 258 does not take place, so that the position of the headrest unit 250 is not changed. The headrest unit 250 is meanwhile held in its functional position solely by the spring 260.

Towards the end of the pivoting back of the backrest unit 240 is a switching operation. By a base fixed switching element provided 226 during the free travel of the backrest unit 240 back to its original position, in this case just before reaching this starting position, the locking member 274 pivoted so that a locking member 274 associated retaining spring 278 relative to the pivot axis of the locking member 274 changes the page. The result is that the locking member 274 in the Fig. 3d can be easily removed in the functional position in a modified orientation in which it is approximately aligned with the transmission member 270.

If now starting from this functional position of the Fig. 3d the backrest unit 240 is again displaced forward, so at that moment, who snaps in Fig. 3e is shown, the locking member 274 on the axle extension 244 of the backrest unit, so that the previously given by the slot 272 translational relative mobility between the transmission member 270 and the backrest unit 240 is eliminated. The intermediate position of Fig. 3e marks therefore an intermediate position, from which the mechanical situation briefly turn that of the embodiment of Fig. 1a-1c equivalent. If now starting from the position of Fig. 3e a return displacement of the backrest unit 240 takes place in the direction of its initial position, the headrest unit 250 is in turn pivoted back in the direction of its stowed position. At the last moment of this Zurückverschwenkens beats the locking member 274 turn, but with a different section on the switching element 226 at. This tilts the locking member 274 back to the starting position of Fig. 3a ,

A complete cycle of transferring the headrest unit 250 from its stowed position to its operative position and back to its stowed position is complete.

All three embodiments described illustrate that the proposed technique with mechanically very simple means provides a way to provide upholstered furniture with headrests, without bringing this in the stowed position or the functional position of an aesthetic or ergonomic disadvantage.

The Fig. 4a to 4d such as 5a to 5f show a fourth embodiment of a piece of seating furniture according to the invention.

This fourth embodiment is characterized by a particularly compact and preferably completely metallic design fitting, through which unlike the previous embodiments, the far forward arranged backrest pivot axis 2 is dispensable.

This fitting is in isolated form in Fig. 4b shown. The fitting comprises two plate-like attachment members 322 for fixed attachment to the base 320 of the seat piece of furniture. These attachment elements define two pivot axes 346a, 347a, around each two main tabs 346 and two main tabs 347 are pivotable relative to the base. At the respective opposite end of the main plates 346, 347 these are connected to the backrest side fixed arms 345 about pivot axes 346b, 347b pivoted. The attachment elements 322 on the one hand and the extension arms 345 on the other hand are thus each connected by two main lugs 346, 347 which together allow the movement of the extension arms 345 and thus the backrest unit 340 relative to the base along a defined path of movement. On this movement path is related to the Fig. 5a to 5f still received in detail. However, it should already be mentioned at this point that the distance of the respective pivot axes 346a, 346b, which is defined by the first main plates, is significantly greater than the distance of the pivot axes 347a, 347b defined by the second main plates. Furthermore, it is relevant that in the in Fig. 4b illustrated state of the fitting, which is associated with the positioning of the backrest in its use position, the main tabs 346, 347 are aligned substantially parallel to each other.

The two first main tabs 346 are interconnected by a connecting tube 348, which is aligned coaxially with the pivot axis 346a. This ensures that the two first main flaps 346, which have a U-shaped structure through the connecting pipe 348, can always only be pivoted together.

Compared with the base-side attachment elements 322 and the headrest unit 350 is pivotable about a headrest pivot axis 4, which in the present case coincides with the pivot axis 346a. The headrest unit 350 comprises as a fitting component a linkage 356, which is fixedly connected to a torsion tube 359. This torsion tube 359 is pushed onto the connecting tube 348 of the first main plates 346. At his related to the Fig. 4b the left side End of the torsion tube 359 is fixedly connected to a rudder horn 358, which thus also about the pivot axis 4, 346a is pivotable. The double-lug system, by means of which the backrest arm 345 is movably connected to the attachment elements 322, is coupled to the rudder horn 358 via a connection system 370 comprising two connection tabs 376, 378 which are pivotable about a pivot axis 377. Furthermore, the connecting plate 376 is pivoted on the mounting member 322 and the connecting plate 378 on the rudder horn 358 pivotally articulated to the headrest pivot axis 4 pivotally. The design with two hinged connection patches 376, 378 alone would lead to a mechanically insufficiently determined system. It is therefore provided that the position of the pivot axis 377 can only move along a defined path of movement, which in Fig. 5b is illustrated by a dashed line. In the embodiment of Fig. 4 and 5 This is achieved by a guide tab 379 which is pivotally connected to the connecting plates 376, 378 about the pivot axis 377 and the other hand pivotally relative to the Fig. 4b left side attachment member 322 is attached.

The use of a connecting system 370 consisting of two connecting straps 376, 378 leads to a special speed profile of the headrest unit 350 when the backrest unit 340 is displaced, as will be explained below.

To illustrate the two end positions of the headrest unit 350 serve the Fig. 4c and 4d in which on the left side of the sofa 310 shown there, the seat unit 330, the backrest unit 340 and in Fig. 4c also a side wall of the sofa shown there are hidden at least for the most part. As compared to the Fig. 4c and 4d can be clearly seen, are the two main tabs 376, 378 both in the initial state of Fig. 4c in which the headrest unit is in the stowed position and in the state of Fig. 4d in which the headrest unit 350 is in the functional position, in the same arrangement. Furthermore, the compact construction of the fitting in the two end states of the movement of the headrest unit 350 can be recognized here.

Based on Fig. 5a to 5f In detail, the transition from the stowage position of the headrest unit 350 to the functional position of the headrest unit 350 is clarified.

Fig. 5a shows the initial state. The headrest unit 350 is arranged in this initial state on the back of the backrest unit 340. In order to achieve the desired functional state, the backrest unit 340 is displaced by manual application of force in the direction of the arrow 5. The movement path results from the dimensions of the two main tabs 346, 347th Since these in the starting position of Fig. 5a are arranged substantially parallel and slightly inclined forwardly downwards, the movement of the backrest unit 340 begins with a substantially straight-line and forward-upward movement, such as the transition from Fig. 5a to Fig. 5b shows. The headrest unit 350 moves initially only to a very small extent in a clockwise direction. For this purpose, the particular tab arrangement is responsible, consisting of the two connecting straps 376, 377 and the guide plate 379. These cause together that initially hardly pivoting of the rudder horn 358 can be seen.

Only when starting from the state of Fig. 5b causing the backrest to advance forward, this movement of the headrest unit 350 reverses and the headrest unit 350 pivots counterclockwise at a comparatively high speed At the same time tilts due to the different lengths of the main tabs 346, 347, the backrest unit 340 in this phase increasingly forward and thus gives sufficient space for the headrest unit 350 free. This in Fig. 5c clarified intermediate state at the same time represents the reverse position of the backrest unit 340. When the piece of furniture in the state of Fig. 5c is located, a relevant amount of kinetic energy in the upwardly pivoted headrest unit 350 is stored. In addition, the tension spring 360 acts on the articulation point 361 on the rudder horn 358, which in the state of Fig. 5c orthogonal to the orientation of the spring 360 is maximally far away from the headrest pivot axis 4, so that the spring favors the continued pivotal movement of the headrest unit 350 upwards. As a result, the overall result is that the backrest unit 340 is moved indirectly pulled by the headrest unit 350 back in the direction of its initial position. This also illustrates the Fig. 5d ,

Just before the backrest unit 340 has reached its initial position, which is also the use position again, already the headrest unit 350 has reached its functional position and even slightly exceeded, so that the backrest unit collision-free back to its use position Fig. 5a and 5f can be brought. This short-term exceeding of the functional position is caused by the shape of the main tab 346 and by the tabs 376, 378, 379.

Only at the last moment of the movement, the direction of movement of the pivotable headrest unit 350 is changed again so that this pivots back slightly to a clockwise direction and then applies to the upper end surface of the backrest unit 350.

The return to the state of Fig. 5a is identical in terms of movement. Again, the backrest unit 340 is first displaced in the direction of the arrow 5, whereby in reverse order the states of Fig. 5a to 5e be run through until the condition of the Fig. 5a adjusts, in which the headrest unit 350 is in its stowage position. The only relevant difference is that in this return transfer, the movement of the headrest unit against the force of the spring 360 must be achieved. However, the potential energy of the descending headrest unit 350 is additionally available for this purpose.

Claims (14)

1. Item of seating furniture (10; 110; 210; 310) in the form of a sofa or armchair having

   - a base (20; 120; 220; 320),

   - a seating surface unit (30; 130; 230; 330),

   - a backrest unit (40; 140; 240; 340) with a back contact surface (42; 142; 242), and

   - a headrest unit (50; 150; 250; 350) with a head contact surface (54; 154; 254),
   wherein

   - the headrest unit (50; 150; 250; 350) can be moved between a storage position and a functional position, in which the head contact surface (54; 154; 254) is substantially flush with the back contact surface (42; 142; 242), and

   - the headrest unit (50; 150; 250; 350) is arranged in such a way in the storage position that the head contact surface (54; 154; 254) is arranged completely behind the back contact surface (42; 142; 242) and below the top edge (42a; 142a; 242a) of the back contact surface,
   wherein

   - the headrest unit (50; 150; 250; 350)

   - can be pivoted about a headrest rotation axis (4) fixed in relation to the base (20; 120; 220; 320) along a nonlinear movement path, or

   - can be moved along a linear movement path relative to the base, and

   - the backrest unit (40; 140; 240; 340) of the item of furniture can be moved relative to the base along a second movement path deviating from the nonlinear or linear movement path of the headrest unit (50; 150; 250; 350) and is provided for manual movement, characterized in that the movement of the backrest unit (40; 140; 240; 340) is coupled to the movement of the headrest unit (50; 150; 250; 350) via a movement mechanism of the headrest unit.
2. Item of seating furniture (10; 110; 210; 310) according to Claim 1,
   characterized in that
   the movement mechanism (4; 58, 56; 158, 156, 159; 256, 258) is designed in such a way that, when the headrest unit (50; 150; 250; 350)

   - is arranged in the storage position, the head contact surface (54, 154; 254) encloses an angle of between 0° and 60°, in particular between 30° and 60°, with a vertical, and/or

   - when it is arranged in the functional position, the head contact surface (54, 154; 254) encloses an angle of between 0° and 30°, in particular between 0° and 15°, with a vertical.
3. Item of seating furniture (10; 110; 210; 310) according to Claim 1 or 2,
   characterized in that
   the headrest rotation axis (50; 150; 250; 350) is arranged below a top edge (42a; 142a; 242a) of the back contact surface (42; 142; 242), preferably at least 10 cm below the top edge of the back contact surface.
4. Item of seating furniture (10; 110; 210; 310) according to one of the preceding claims,
   characterized in that
   the headrest unit (50; 150; 250; 350) can be pivoted counterclockwise out of the storage position into the functional position, in a transverse direction of the furniture based on a lateral perspective, in which the seating surface (30; 130; 230; 330) of the item of seating furniture is arranged on the right-hand side of the back contact surface (42; 142; 242).
5. Item of seating furniture (310) according to one of the preceding claims,
   characterized in that
   the backrest unit (340) is movably connected to the base (320) by at least two main links (346, 347), wherein

   - the first main link (346) can be pivoted about a first pivoting axis (346a) fixed in relation to the base (320) and about a second pivoting axis (346b) fixed in relation to the backrest unit (340), and

   - the second main link (347) can be pivoted about a third pivoting axis (347a) fixed in relation to the base and about a fourth pivoting axis (347b) fixed in relation to the backrest unit (340).
6. Item of seating furniture according to Claim 5,
   characterized in that
   a connecting unit (370) is provided between the second main link (347) and the headrest unit (350), which is attached to the second main link (347) in such a way as to be pivotable about a fifth pivoting axis (370b) offset relative to the third pivoting axis (347a) and which is attached to the headrest unit (350) in such a way as to be pivotable about a sixth pivoting axis (370a) offset relative to the headrest rotation axis (4), wherein

   - the connecting unit is designed as a rigid connecting link which defines an invariable distance between the fifth and the sixth pivoting axis, or

   - the connecting unit (370) has two connecting links (376, 378), which are articulated on one another in such a way as to be pivotable relative to one another about a seventh pivoting axis (377), of which a first link (378) is articulated pivotably on the headrest unit (350) and of which a second link (376) is articulated pivotably on the second main link (347), wherein the seventh pivoting axis (377) can be moved in relation to the base (320) only along a defined path (378).
7. Item of seating furniture (310) according to Claim 5 or 6,
   characterized in that

   - the main links (346, 347) are aligned substantially parallel to one another in the storage position of the headrest unit (350), and/or

   - the first main link (346) is at least 20% longer than the second main link (347).
8. Item of seating furniture (310) according to one of Claims 5 to 7,
   characterized in that
   at least two first and/or at least two second main links (346) are provided, wherein these two main links (346) are pivotable relative to the base (320) and relative to the backrest unit (340) about respectively identical pivoting axes (346a, 346b), and wherein these two main links (346) are connected rigidly to one another by a connecting rod or a connecting tube (348).
9. Item of seating furniture (10; 110; 210; 310) according to one of the preceding claims,
   characterized in that
   the backrest unit (40; 140; 240; 340) can be moved between an initial position and a reversal position, wherein the coupling of the backrest unit (40; 140; 240; 340) to the headrest unit (50; 150; 250; 350) by means of the movement mechanism (4; 58, 56; 158, 156, 159; 256, 258; 370) is designed in such a way that the movement of the backrest unit (40; 140; 240; 340) from the initial position into the reversal position and back into the initial position is suitable for moving the headrest unit (50; 150; 250; 350) out of the storage position into the functional position or out of the functional position into the storage position.
10. Item of seating furniture (210) according to Claim 9,
    characterized in that
    the backrest unit (240) is connected in phases to the movement mechanism (4; 256, 258) of the headrest part (250) and decoupled in phases from the movement mechanism of the headrest unit (250) during transfer from the initial position, via the reversal position, back into the initial position, wherein, in particular, the backrest unit (256, 258) is preferably coupled to the movement mechanism and/or decoupled therefrom depending on its movement phase by means of a changeover gear (274, 272, 278, 226).
11. Item of seating furniture (210) according to Claim 10,
    characterized in that
    the backrest unit (240) is coupled to the headrest unit (250) in phases in such a way that

    - transfer of the headrest unit (250) from the storage position into the functional position can be achieved only by moving the backrest unit (240) from the initial position into the reversal position, while the headrest unit (250) is decoupled from the backrest unit (240) during the subsequent movement of the backrest unit (240) into the initial position, and/or

    - transfer of the headrest unit (250) from the functional position into the storage position can be achieved only by moving the backrest unit (240) from the initial position into the reversal position, while the headrest unit (250) is decoupled from the backrest unit during the subsequent movement of the backrest unit (240) into the initial position.
12. Item of seating furniture (10; 110; 310) according to Claim 9,
    characterized in that
    the backrest unit (40; 140; 340) is coupled permanently to the headrest unit (50; 150; 350) by means of the movement mechanism (4; 58, 56, 70; 158, 156, 159; 170; 370) in such a way that, during the movement of the backrest unit (40; 140; 340) out of the initial position into the reversal position, the headrest unit (50; 150; 350) is arranged in an intermediate position between the storage position and the functional position when it reaches the reversal position.
13. Item of seating furniture (10; 110; 210) according to one of the preceding claims,
    characterized in that

    - the headrest unit (50; 150; 250) is pivotably movable about the headrest rotation axis (4),

    - the backrest unit (40; 140; 240) is pivotably movable about a backrest unit axis (2), and

    - the movement mechanism (58, 56, 70; 158, 156, 159; 170; 258, 256, 270) comprises a transmission member, which is attached to the headrest unit (50; 150; 250) and the backrest unit (40; 140; 240) in each case eccentrically with respect to the headrest rotation axis (4) and eccentrically with respect to the backrest unit axis (2), respectively.
14. Item of seating furniture (50; 150; 250; 350) according to one of the preceding claims,
    characterized in that
    the headrest unit (50; 150; 250; 350) is arranged in such a way in the storage position that at least a contact surface (54; 154; 254) facing forward in the functional position is not visible from the outside in the storage position of the headrest unit (50; 150; 250; 350).

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